Search results for "fragipan"
showing 2 items of 2 documents
Segregated ice and liquefaction effects on compaction of fragipans
2004
The brittleness of fragipans is generally ascribed to the close-packing fabric arrangement acquired at the initial step of pedogenesis thanks to physical processes. However, there is an on-going debate over the agent causing soil densification. In this work, we tested the plausibility that ice segregation or liquefaction could have been the cause of the compaction of four fragipans. Two of them are located in nonseismic areas that have experienced periglacial conditions; one is from a strongly seismic area not affected by periglacial conditions, while the fourth site underwent moderate seismic activity and slight periglacial conditions. After disaggregation in the laboratory, soil specimens…
Development of protofragipanic horizon after severe degradation processes of greenhouses soil
2014
Plant growing in greenhouses and plastic tunnels has some advantages: obtaining early production, plant protection against hail, hoarfrost, late spring and early autumn frosts. The main criteria considered for setting greenhouses are the existence of heating and water sources. Due to the compulsory location imposed by the above conditions, many greenhouses were placed on soils having low capability. After application of ameliorative measures some satisfactory results could be obtained on a relatively short period. Our studies on some soils in greenhouses and plastic tunnels in Romania have shown that after 15-20 years of the intensive exploitation an impermeable soil horizon with brittle bl…